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-- OBJECT NAME         : Backup_ThanNhanTao
--
-- AUTHOR               : QuyPV
--
-- INPUTS    : @Path - location of the backups
--        @dbType - which databases to backup - All, System, or User
-- OUTPUTS    : None
-- DEPENDENCIES         : None
--
-- DESCRIPTION         : This stored procedure performs a full backup on all of the user databases
--
-- EXAMPLES (optional)  : EXEC Backup_ThanNhanTao @Path = 'F:\MSSQL\Backup\', @dbType = 'All'
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Alter PROC Backup_ThanNhanTao
(
	@Path VARCHAR(1000)
	,@dbType VARCHAR(6)
	,@dbNameOnly VARCHAR(100)
	,@returnValue int out
	,@fileNameBackup varchar(500) out
)
AS

-- To allow advanced options to be changed. 
EXEC sp_configure 'show advanced options', 1 
-- To update the currently configured value for advanced options. 
RECONFIGURE 
-- To enable the feature. 
EXEC sp_configure 'xp_cmdshell', 1 
-- To update the currently configured value for this feature. 
RECONFIGURE 

SET NOCOUNT ON

DECLARE @Now CHAR(14) -- current date in the form of yyyymmddhhmmss
DECLARE @DBName SYSNAME -- stores the database name that is currently being processed
DECLARE @cmd SYSNAME -- stores the dynamically created DOS command
DECLARE @Result INT -- stores the result of the dir DOS command
DECLARE @RowCnt INT -- stores @@ROWCOUNT
DECLARE @filename VARCHAR(200) -- stores the path and file name of the BAK file

CREATE TABLE #WhichDatabase
(
 dbName SYSNAME NOT NULL
)

-- Get the list of the databases to be backed up
IF @dbType = 'All'

 INSERT INTO #WhichDatabase (dbName)
 SELECT [name]
 FROM master.dbo.sysdatabases
 WHERE [name] <> 'tempdb'
 ORDER BY [name]

ELSE
BEGIN

 IF @dbType = 'System'

  INSERT INTO #WhichDatabase (dbName)
  SELECT [name]
  FROM master.dbo.sysdatabases
  WHERE [name] IN ('master', 'model', 'msdb')
  ORDER BY [name]

 ELSE
 BEGIN

  IF @dbType = 'User'

   INSERT INTO #WhichDatabase (dbName)
   SELECT [name]
   FROM master.dbo.sysdatabases
   WHERE [name] NOT IN ('master', 'model', 'msdb', 'tempdb')
			AND [name] = @dbNameOnly
   ORDER BY [name]

  ELSE
  BEGIN

   DROP TABLE #WhichDatabase

   SET @returnValue = -1
   RETURN @returnValue

  END

 END

END

-- Get the database to be backed up
SELECT TOP 1 @DBName = dbName
FROM #WhichDatabase

SET @RowCnt = @@ROWCOUNT

-- Iterate throught the temp table until no more databases need to be backed up
WHILE @RowCnt <> 0
BEGIN 

 -- Get the current date using style 120, remove all dashes, spaces, and colons
 SELECT @Now = REPLACE(REPLACE(REPLACE(CONVERT(VARCHAR(50), GETDATE(), 120), '-', ''), ' ', ''), ':', '')

 -- Build the .BAK path and file name
 -- SELECT @filename = @Path + @DBName + '\' + @DBName + '_' + @Now + '.BAK' 
 SELECT @filename = @Path + @DBName + '_' + @Now + '.BAK'
 SET @fileNameBackup = @filename
 -- Build the dir command that will check to see if the directory exists
 SELECT @cmd = 'dir ' + @Path + @DBName

 -- Run the dir command, put output of xp_cmdshell into @result
 EXEC @result = master.dbo.xp_cmdshell @cmd

 -- If the directory does not exist, we must create it
 IF @result <> 0
 BEGIN
  
  -- Build the mkdir command  
  --SELECT @cmd = 'mkdir ' + @Path + @DBName
  SELECT @cmd = 'mkdir ' + @Path

  -- Create the directory
  EXEC master.dbo.xp_cmdshell @cmd, NO_OUTPUT

 END
 -- The directory exists, so let's delete files older than two days
 ELSE
 BEGIN

  -- Stores the name of the file to be deleted
  DECLARE @WhichFile VARCHAR(1000)

  CREATE TABLE #DeleteOldFiles
  (
   DirInfo VARCHAR(7000)
  )

  -- Build the command that will list out all of the files in a directory
  --SELECT @cmd = 'dir ' + @Path + @DBName + ' /OD'
  SELECT @cmd = 'dir ' + @Path + ' /OD'

  -- Run the dir command and put the results into a temp table
  INSERT INTO #DeleteOldFiles
  EXEC master.dbo.xp_cmdshell @cmd

  -- Delete all rows from the temp table except the ones that correspond to the files to be deleted
  DELETE 
  FROM #DeleteOldFiles
  WHERE ISDATE(SUBSTRING(DirInfo, 1, 10)) = 0 OR DirInfo LIKE '% 

%' OR SUBSTRING(DirInfo, 1, 10) >= GETDATE() - 2 

  -- Get the file name portion of the row that corresponds to the file to be deleted
  SELECT TOP 1 @WhichFile = SUBSTRING(DirInfo, LEN(DirInfo) -  PATINDEX('% %', REVERSE(DirInfo)) + 2, LEN(DirInfo)) 
  FROM #DeleteOldFiles

  
  SET @RowCnt = @@ROWCOUNT
  
  -- Interate through the temp table until there are no more files to delete
  WHILE @RowCnt <> 0
  BEGIN
  
   -- Build the del command
   --SELECT @cmd = 'del ' + @Path + + @DBName + '\' + @WhichFile + ' /Q /F'
   SELECT @cmd = 'del ' + @Path + @WhichFile + ' /Q /F'
   
   -- Delete the file
   EXEC master.dbo.xp_cmdshell @cmd, NO_OUTPUT
   
   -- To move to the next file, the current file name needs to be deleted from the temp table
   DELETE
   FROM #DeleteOldFiles
   WHERE SUBSTRING(DirInfo, LEN(DirInfo) -  PATINDEX('% %', REVERSE(DirInfo)) + 2, LEN(DirInfo))  = @WhichFile

   -- Get the file name portion of the row that corresponds to the file to be deleted
   SELECT TOP 1 @WhichFile = SUBSTRING(DirInfo, LEN(DirInfo) -  PATINDEX('% %', REVERSE(DirInfo)) + 2, LEN(DirInfo)) 
   FROM #DeleteOldFiles
  
   SET @RowCnt = @@ROWCOUNT
  
  END
  
  DROP TABLE #DeleteOldFiles

 END

 -- Backup the database
 BACKUP DATABASE @DBName
 TO DISK = @filename
 WITH INIT

 -- To move onto the next database, the current database name needs to be deleted from the temp table
 DELETE
 FROM #WhichDatabase
 WHERE dbName = @DBName

 -- Get the database to be backed up
 SELECT TOP 1 @DBName = dbName
 FROM #WhichDatabase

 SET @RowCnt = @@ROWCOUNT
 
 -- Let the system rest for 5 seconds before starting on the next backup
 WAITFOR DELAY '00:00:05'

END

DROP TABLE #WhichDatabase

SET NOCOUNT OFF

SET @returnValue = 0
RETURN @returnValue


